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I don't have one since my work involves no desk but wow you have room for that? I'd go dark substrate and planted if that's your preference and some nice rock work or even driftwood . As far as stock, it depends, do you want an active tank (possibility of being distracting) or a calmer/more serene tank?
I'm not a huge fan of black substrate so ill probably go brown or dark brown.
Also my intended stock is my neon blue dwarf gourami who's currently in my 50 gal with two of the orange drawf gouramis so I'll move him over and then put in a bunch of plants to cycle. Afterwards ill add a smaller more decoratively colored pleco and hopefully some glass cats or celestrial pear danios. Probably about 5 of whichever I choose. Glass cats like plants and so do gouramis so I'm leaning that way.